Threaded Plug Gage, Dimension Type Inch, Gauge Type Go (Plus), Handle Design Member Only, Included Handle Taperlock 5, Thread Class 2A, 3B, Thread Size 1 3/8 In.-18, Thread Type UNEF, Tolerance Class X, Gauge Finish Chrome Plated, Gauge Length – Go Member 1 in, Gauge Material Tool Steel, Handle Color Light Blue, Hardness RC 70/72, Included Certification Certificate of Accuracy, Long Form Calibration Certificate No, Pitch Diameter – Go Member 1.3389 in, Standards ISO 17025